Technology of steel pickling in reducing melt

Wire coils of stainless and special steels

During forming and heat treatment of highly alloyed steels, an oxidic layer generates in the surface created by iron oxide and other alloying element oxides.  This layer must be removed off the steel surface using a chemical process.  A considerable part of the metal oxides contained in the layer of the scale is poorly soluble or insoluble in acids. For pickling of those steels, pickling technology in melts is therefore used with advantage.

Their use improves the conditions for the subsequent final pickling in acids.  The used melt is called reduction, according to the type of the chemical treatment.  The basic ingredient is sodium hydroxide supplemented with the reducing component and the chemical effect of the melt.  In reduction procedures, the melt contains an active ingredient - sodium hydride.  Compared to the oxidizing descaling, reduction descaling has many advantages.  Yet hardly picklable or even non-picklable steels and alloys can be pickled, and the quality of the steel surface after pickling improves, and the exposure times in acids get shorter.  The shorter exposure times allow reduction of the consumption of final pickling acids, and the weight reduction of steels during pickling minimize, which subsequently reduces the amount of rinsing waters and neutralisation sludge. As concerns the Hydride technology of steel pickling, BOCHEMIE in collaboration with EKOMOR s.r.o. Frydek Mistek is the only company in the world able to offer this unique technology and implement it.

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